Caro

Tic-tac-toe, two ways.

Classic 3 × 3 or caro: five in a row on a board that never ends. Play a stranger, a friend, or the computer.

Five in a row on an endless board.

Play the computer

Pick how hard it should try.

You can play right away as a guest. Create an account to keep your record.

Open rooms6

  • KT
    Kevin Tran is waiting
    Caro · just now
  • TD
    Turbo Donut is waiting
    Caro · 5m ago
  • SO
    Sleepy Otter is waiting
    3 × 3 · 7m ago
  • SP
    Salty Pickle is waiting
    3 × 3 · 7m ago
  • QH
    Quang Huy is waiting
    3 × 3 · 7m ago
  • GM
    Grumpy Mango is waiting
    Caro · 7m ago

How it works

  • X always moves first; players swap marks every game.
  • A clock runs on each turn. Run out of time and you forfeit.
  • Games against people and against the computer are counted separately.
Full rules and tips

About Caro Online

Caro is the Vietnamese name for gomoku, five in a row: two players take turns placing X and O on a grid, and the first to line up five marks wins. Here the board never ends, so the game is all about reading threats, not running out of space.

Prefer something quicker? Classic 3 × 3 tic-tac-toe is a game of seconds. Both modes run in the browser on any phone, tablet or computer, with nothing to install.

Questions

Do I need an account?
No. Press Quick match and you play right away as a guest with a random name. Create a free account whenever you want to keep your win/loss record across devices.
How do I play with a friend?
Choose Play a friend, pick public or private, and share the link. Public rooms are also listed on this page so anyone can join.
Is there a computer opponent?
Yes. Choose Easy, Medium or Hard. Hard plays perfect 3 × 3 and searches several moves ahead in caro.
What are the rules of caro?
X moves first. Five or more of your marks in a row, column or diagonal wins. Each turn has a clock; if it runs out you forfeit. Marks swap every game.
Is it free?
Completely free. No ads, no downloads, no sign-up required.